HI
The form name is the form name you created. In this case, the value is "ContactForm".
DataFolderName: When you want to submit the form value to a content folder, you can create a text schema and content folder to match it. Set the folder name to DataFolderName, the data will add to the folder when user post the data.
For more detail, I have create a demo in the demo.kooboo.com. You can go and see it. NOTE: The demo site will be reset next 3:00:00 AM UTC.
Regards,
Jifeng Huang
Kooboo Team
Microsoft ASP.NET MVP